The DDX_LBIndex function manages the transfer of int data between a list box control in a dialog box, form view, or control view object and an int data member of the dialog box, form view, or control view object.
void AFXAPI DDX_LBIndex( CDataExchange* pDX, int nIDC, int& index );
- A pointer to a CDataExchange object. The framework supplies this object to establish the context of the data exchange, including its direction.
- The resource ID of the list box control associated with the control property.
- A reference to a member variable of the dialog box, form view, or control view object with which data is exchanged.
When DDX_LBIndex is called, index is set to the index of the current list box selection. If no item is selected, index is set to -1.
For more information about DDX, see Dialog Data Exchange and Validation.